Haier GE NF96DS Service Manual page 29

Roof Terminated
Exhaust Pipe
Ventilation
Furnace
Louvers
(Crawl Space)
Coupling or
3 in. to 2 in.
Transition
(Field Provided)
* See Maximum Vent Lengths table
NOTE-The inlet and outlet air openings shall each have a
free area of at least one square inch per 4,000 Btu (645mm
per 1.17kW) per hour of the total input rating of all equipment
in the enclosure.
Figure 26. Equipment in Confined Space
(Inlet Air from Ventilated Crawl Space and Outlet Air
to Outside)
General Guidelines for Vent Terminations
In Non-Direct Vent applications, combustion air is taken from
indoors and the flue gases are discharged to the outdoors.
The NF96DS is then classified as a non-direct vent, Category
IV gas furnace.
In Direct Vent applications, combustion air is taken from
outdoors and the flue gases are discharged to the outdoors.
The NF96DS is then classified as a direct vent, Category IV
gas furnace.
In both Non-Direct Vent and Direct Vent applications, the
vent termination is limited by local building codes. In the
absence of local codes, refer to the current National Fuel
Gas Code ANSI Z223-1/NFPA 54 in U.S.A., and current
CSA-B149 Natural Gas and Propane Installation Codes in
Canada for details.
Position termination according to location given in Figure 28
or Figure 37. In addition, position termination so it is free
from any obstructions and 12" above the average snow
accumulation.
At vent termination, care must be taken to maintain protective
coatings over building materials (prolonged exposure to
exhaust condensate can destroy protective coatings). It is
recommended that the exhaust outlet not be located within
6 feet (1.8m) of a condensing unit because the condensate
can damage the painted coating.
31-5000729 Rev. 0
Inlet Air
Minimum
12 in. (305mm)
above Crawl
Space Floor
*Intake Debris Screen Provided
2
NOTE: See Table 12 for maximum allowed exhaust pipe
length without insulation in unconditioned space during
winter design temperatures below 32°F (0°C). If required
exhaust pipe should be insulated with 1/2" (13mm) Armaflex
or equivalent. In extreme cold climate areas, 3/4" (19mm)
Armaflex or equivalent may be necessary. Insulation must
be protected from deterioration. Armaflex with UV protection
is permissable. Basements or other enclosed areas that are
not exposed to the outdoor ambient temperature and are
above 32 degrees F (0°C) are to be considered conditioned
spaces.
Do not use screens or perforated metal in exhaust
terminations. Doing so will cause freeze-ups and may
block the terminations.
For Canadian Installations Only:
In accordance to CSA International B149 installation
codes, the minimum allowed distance between the
combustion air intake inlet and the exhaust outlet
of other appliances shall not be less than 12 inches
(305mm).
Page 29
IMPORTANT
IMPORTANT